Ncert Exercises & Solutions

Some of these terms/chemicals are associated with the C₄ cycle. Explain.

1. Hatch Slack pathway

2. Calvin cycle

3. PEP carboxylase

4. Bundle sheath cells

The terms associatedwith C₄ cycle are

Hatch Slack Pathway The process of synthesis of glucose in C₄ plants is different from C₃ plants which was discovered by two scientists MD Hatch and CR Slack (1977). Hence, named Hatch Slack pathway.

PEP Carboxylase It is an enzyme present in mesophyll cells of C₄ plants. It fixes CO₂ to form 4-carbon compound, i.e., oxaloacetate (OAA).

Bundle Sheath Cells These are specialised sclerenchymatous cells present arround the vascular bundle, in the veins of monocot leaves. These have agranal chloroplast. C₃ cycle occurs in these cells to manufacture glucosein C₄ plants.

Calvin Cycle This cycle operates in bundle sheath cells and fixes CO₂ to form glucose molecules.

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